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Hydrodemolition surface preparation keeps Liberty Tunnel rehabilitation project on schedule in Pittsburgh. The Pennsylvania state Department of Transportation selected hydrodemolition surface preparation for the US$18.8 million rehabilitation of Pittsburgh’s Liberty Tunnels. Time was of the essence to complete the project on deadline without penalties and hydrodemolition was selected as it offered a fast and cost-effective method to prepare the tunnel walls for a new, shotcrete surface. This methods off

Major gains in tunnelling productivity and performance are claimed for a series of new machines now coming to market These new tools will help contractors boost productivity and versatility in an array of applications. The new equipment items are designed for a variety of tasks, including drilling and shotcreting duties. One of the leaders in the underground equipment sector, Atlas Copco, has a new line-up of single and twin boom drill rigs, which suit duties in smaller tunnelling applications. The fi

Using ground penetrating radar to determine reason for serious pavement settling in Kentucky-Tennessee tunnel Just a few years after the opening of the Cumberland Gap Tunnel, highway officials noticed moderate to severe settling of the continuously reinforced concrete pavement. The mountain tunnel provides an important link between Kentucky and Tennessee along US25E and the problem looked serious, with many voids discovered beneath the pavement surface. To investigate the problems, the Kentucky Transpor

UK firm Siltbuster is now offering a larger and more powerful wet waste separation system. The new Gritbuster WT-250 is a larger version of the company’s proven technology for material washing, separation and aggregate recovery. The Gritbuster WT-250 is aimed at the road sweeping & trommel fines waste recycling markets and is capable of handling in excess of 25tonnes/hour. Using well established wet separation processes, the plant separates feedstocks into washed gravel and sand products. Raw material

Italian firm FAE Group has developed a novel Multi-Purpose machine range for use in road recycling applications. These versatile units form part of FAE's Construction line and have been designed to be reliable and efficient even in harsh working conditions. The highly rugged items of equipment are designed to deliver fast ground stabilisation working on roads, highways and airports, as well as other major infrastructure jobs. The units can also be used to build and maintain unpaved roads The Multi-Pu

Equipment from the Wirtgen Group has played an important role in stabilising the area being developed for a new industrial zone in Germany. The site of a new factory located in Backnang, including access roads and parking areas has seen the use of the Wirtgen machines to help address poor ground conditions. The contractor employed a Wirtgen WR 200i soil stabiliser, two Hamm compactors and a Streumaster SW 16 MC binding agent spreader to improve the ground properties the soil. The firm, Riva, expanded

Road recycling technology was one focus area at the recent World of Asphalt exhibition in the US city of Baltimore - Mike Woof writes. The economic and environmental benefits to be gained from recycling road materials are well understood. In many markets such as North America, Europe and now China, the percentage of road materials being recycled is on the increase. New technologies are helping make recycling more efficient and widening the possibilities for contractors and clients One innovative deve

Caterpillar vice president Paolo Fellin sums up the past year for the global equipment manufacturer and looks at the increasing importance of telematics and machine control. David Arminas reports from Caterpillar’s Demonstration and Learning Centre in Malaga, southern Spain First the good news. Despite the difficulties, especially of the financial markets, 2014 was “a record year for a lot of things” for global heavy equipment maker Caterpillar.Now the bad news. Hang onto your seats because despite some

Engine technology is advancing, with lower emissions, lower fuel consumption and longer service intervals being key developments - Mike Woof reviews some of the latest developments A huge investment in diesel engine technologies in recent years has seen manufacturers develop low emission diesels that are quieter, cleaner and use less fuel, while in many instances delivering more power. For machine manufacturers this has been a major benefit, allowing them to meet tougher regulations on noise and exhaust